Scott is reportedly telling friends that ‘if he wasn’t with Kourtney, he would be sleeping with Kim.’ Do you believe it?

As if we all needed another reason to hate on Scott Disick, a shocking new report in the latest In Touchclaims he’s going behind girlfriend Kourtney Kardashian‘s back to get with the woman he really wants, her sister Kim! “Scott always makes sexual and suggestive comments to Kim,” a source tells the mag. “When Kim bends over or is wearing something revealing, Scott will … comment that she has the ‘best ass.'” And while Kourtney laughs along awkwardly, the source claims she’s broken up inside.

And Kourtney isn’t the only who’s reportedly upset by Scott’s advances. “Kris [Jenner] can’t stand it,” the source says. “She keeps telling him not to do that to [Kourtney.]”

But it might not be all on Scott. The source alleges that Kim has been leading him on! Besides flirting with her sister’s baby daddy, Kim is said to be “threatened by her sisters’ fame.”

Here’s the evidence behind Scott’s alleged interest in Kim:

Scott made a toast during Kim’s 30th birthday party at Via dei Mille in NYC, “announcing to everyone how much he ‘loves’ Kim.” Kourtney was also seated at a separate table with their son Mason, while Scott “sat very close to Kim, chatting her up.”

“Scott seemed to be obsessed with Kim” while the trio filmed Kourtney & Khloe Take New York this summer. Kourtney even reportedly walked in on Kim and Scott in their hotel room, and Scott was in the middle of showering Kim with awkward compliments.

Scott defended Kim in Oct. 2010 when someone called her a name at Juliet’s Supper Club in NYC. “No one is allowed to talk to her like that!” he screamed at the stranger.